Acoustical apparatus



April 27,192.60 1,582,285

F. D. LEWIE? ACOUSTIGAIJ APPARATUS Filed 1924 2 sheets-anew. 1

A i il 27 ,'1926.

Y F. D. LEWlS ACOUSTICAL APPARATUS Filed Nov. 14 1924 2 Sheets-Sheet 2 jmifmtm 30215.

Patent ed Apr. 27, 1926.

UNITED STATES FRANK D. LEWIS, OF WEST ORANGE. NEW' JERSEY, ASSIGNGR T6 EATER PHONE- GKAIH AND RADIO CORPOR ION, OF BROOKLYN, NEVJ YORK, A CQEPGRATIQW 0F YORK ACOUSTICAL AZPARATUS.

7 '0 all whom, it may concern:

Be it known that I, FRANK D. Lewis, a citizen of the United States, and a resident of \Vest Orange, in the'county of Essex and State of New Jersey, have invented certain new anduseful Improvements in Acoustical Apparatus, of which the following is a'speeilieation.

My invention relates broadly to acoustical apparatus and more particularly to a construction of combined phonograph repro-" ducer and recorder and electromagnetic round reproducing and recording apparatus The object of, my invention is to provide a, device for connection to a phonograph which embodies an integral loud speaker for a radio receiving apparatus and a'phonograph recording and reproducing device.

Another. object of e invention is to pro vide a tone arm attachment for existing phonographs or a mountingadapted to be installed asa'permanent fitting upon phonographs as manufactured for the reproduo' tion of received radio broadcast signals or: for the reproduction of phonograph records and for the further purpose of recording' upon a phonograph record incoming radio signaling energy;

Still another object of my invention is the provision of an integral structure form: ing both a radio loud speaker and a phon are provided by which the structurQ m-ay be employed independently for Qne or another of the said functions without impairingthe efficiency or operating qtialities A of the structure when serving in anyoi'the said functions. v

My lnve'ntion further resides 111 the ar rangement of parts of a combined radio loud. speaker and phonograph reproducer and recorder having a rotary valve device for selecting the particular function which is tobe employed inthe apparatus to the exclusion of other functions.

My invention also has for an object the constructionoi a unit for connection upon the tone arm of a phonograph including an electromagnetic operating device and diaphragm and a phonograph diaphragm with means for eliminating"sympathetic vibrations in one or the other of the diaphragms when only one of said diaphragms is being usefully employed;

Still another. object of the invention is to provide an adjustable balancing device for a combined unit as lrrein described whereby the pressure of the recording or reproducing stylus upon the sound record may be regulated.

A still further objectof the invention the provision of an auxiliary weight carrying arm disposed upon the clectrhmegnetie receiver portion of a combina ion radio loud speaker and a phonograph sound he unit and stylus which is adapted to be lowered in position upon a record disl: for guiding the sound h .1: and stylus unit with re spect to the record during the process of re energy ore due-- a plan View of the loud speaker and reproducer unit showing the method of mounting the unit on the phonograph tone arm; Fig. 3 is an enlarged diagmm looking at the end of the electromagneticsound reproducer portion of the unit; Fig". r is a horizontal section view of the combination unit showing the vaive device positioned in such manher that vibrations from the diaphragm of the electromagnetic portion of the device are impressed directly upon the diaphragm of the sound box for the recording of incoming radio signaling energy; Fig, 5 shows the positioning of the valve device in the unit for directing the received radio signaling energy directly into the tone arm of the phonograph for the acoustical reproduction thereofyhig. 6 shows the positioningof the valve device for the reproduction of sound from a sound record by HIEELDSGIE the phonograph sound box and tone arm in to which the reproduced sound is directed; Fig. '2' is a side view of the unit partially in.

x he vertical section showing the arrangement of the rotary valve device in the unit; and, Fig. 8 is a diagrammatic view showing the arrangement of the electrical circuits employed in the loud speaker portion of the unit when used as reproduce'r oi radio signals.

i am aware that it has been proposed here toiore to provide a tubular device which will adapt a radio receiver to the tone arm .of a phonograph to enable the sound ampii flying horn oi the phonograph to be employed in the reproduction or? radio concerts out in order to do this it has been necessary to remove the reproduccr from the phonograph tone arm and replace it by the adapter. .bi lllfi is an undesirable feature in. that a phonograph sound box is adelicate mechanism and might readily be injured in the repca ,ed rentzoval processes. It has also been proposed to provide tone arms for phonographs having a pair of extended branches, one for the phonograph sound born and the other for a telephone receiver. The existence i those branches often introduces undesirable interference and distortion in the reproduction of the sound by reason of the sympathetic vibration of the air colunms in the tubes.'

By the structure or my invention I have overcome these and other disadvantages inherent in the prior structures.

Referring to the drawings in detail, reference character 1 designates the upper portion of a phonograph. The rotatable re"- ord table is indicated by reference character 2 carrying phonograph record'fl. Swivel arm 5 is mounted on the phonograph 1 and forms the tone arm for conveying sound from the unit i i to the amplifying horn in the phonograph. The unit t is pivotally secured upon the extremity a of the tone arm 5. The unit 14 is supported by means of a laterally extending arm 6 having a substantially 'Q shapcd portion '7 with an extension 8 pivorclly supported in the ore tremifl i of the tone arm At the end of the arm 6 prc 'idc a slidable weight 9 adjustable in po -tron in the longitiulinr-il slot 11 under control *5 thumb screw 10. An extension 12 secured upon unit 14 and connects the unit with the extremity of arm 6, delivering sound through the extension 12, the tubular i shapcd port on 7, the swivel portion 8. the c;' ;tr .emit v 4 of the tone arm 5, and into the sound amplifying horn. The unit l4- compriscs a phonograph sound box if) and an electromagnetic sound r produccr ill. The clcc 'n'o-mnrguc" sound I'CI'HOdUCl-i' l comprises :1 casing; into one end of which screwed a sup uutiug cud mcmbcr 17 having a finger grip 18. On the inner fare of tlirend n'wclubcr l? is mounted a. permanent nu gue l9 and clecti'omagncts 20 arrangcd adjacen magnetic diaphragm no aces 21 secured in position about its periphery by means of gasket 22. In order to limit the gap between the faces of the pole pieces of electro-magnets 20 and the diaphragm, 1. provide limit stops 36 cooperating with projection 37 on casing 16. The electro-mag- 4 )hra m 25 maintained in osition b means of gaskets 26. A rotatable valve 27 is jourthe ends of ports 28, 29 and 30. The valve is journaled at 31 and is rotated by means of stem .32 from control handle 33 which projects in the space between the electromagneticcpcrating mechanism and the phonograph sound box. In order to indicate on the outside of unit 14 the position of valve 27, I provide an indicating arm 34 adjacent the p "phcry of rotatable disk and control handle I The phonograph sound box containing diaphragm 25 is operated through lover arm pivoted at 36, the lever being controlled by stylus 37 Working upon disk record 3 during either the recording or reproducing process will be hereinafter described. Leads 38 pass through the end member 17 connecting with the elcctro-magncts 20, of the clcctro-magnctic operating mechanism. For purposes of recording incoming signaling energy upon the phonograph record, I provide a recording guide arm 39 upon the casing 16 ot the electromagnetic operating mechanism. The guide arm 39 is pivotally mounted at 40 and is under tension of a spring 41 spiralcd around the' pivot. The arm 39 has an extension 42 on one end flu-rcof in the form of a coin face adapted to co operate with a cam face 4% upon a segmental member 4-3 secured upon tho cylindrical surface or" theelcctro-magnetic operating mechanism casing 16 by means of 's 'rcws passing lbro'ugh short longitudinal slots. The member may be slid circuml'crcntially by a finger piece 45 to move cam facc ll tovurds or away from cam face 42 whereupon the position of member 39 will be changed. The ncmbcr 239 carries a stylus 46. When they member 39 is in lowered position the stylus 46 engages the usual spiralcd guide groove formed in the surface oi the record.

Reference is made to YVadsworth latcut l.42l,0+l5 datedllunc 27 1922, as an example oi? the type of record to which I rofcr. The stylu 46 operates to guide the recording stylus :52" in a substantially spiral path over the surface of the record, enabling the move- -naled within the portion 23 intermediate messe merit of stylus 37 to make the desired impressionin.the-record between the guiding groove.

Fig. 8 represents the electrical connections of the unit to a radio receiving apparatus.

. \Vhere it isdesired to reproduce the incoming radio concert or lecture at some subsequent time, I position the valve .27 to convey sound waves from diaphragm LI throng port 29,-valve 27 and port 30, as represented in Fig. 4. The sound vibrations on diaphragm 21 are therefore impin ed upon diaphragm 25 actuating the sty us lever 35.

When it is desired to directly reproduce the radio lecture or concert, valve 27 is posi-- ti'oned as represented in Fig. 5, whereby port 529 communicates directly w1thport'28 and conveys the sound energy to the phonograph sound amplifying horn. \Vhen it is desired to utilize the apparatus as a phonograph, the valve 27 is positioned as represented in 1 Fig. 6 so that sound energy from diaphragm 25 is conveyed through ports 30 and 28 to the sound amplifyinghorn. It wiii be observed in all cases that the valve 2? serves to cut off those ports which are not crnpicyed in either the recording or reproducing 1. ocess, thereby eliminating interference which may arise from sympathetic vibrations.

The apparatus of this-invention may be readily attached to present phonograph installations or it may be installed when the phonograph is originally constructed, roviding a universal device for the repro uction of radio concerts or phonograph music, or the direct recording of radio concerts for subsequent phonograph reproduction.

\Vhile I have described my invention in certain particular embodiments. I desire that it he understood that modifications may he made and that I intend no limitations upon the invention other than are imposed by the sco )e of the appended claims.

hat I'claim and desire to secure by Letpars. Patent of the United States is as fol-- ows: 1. A combined phonographand electromagnetic sound rcproducing unit, compris-' ing a pivotally mounted tubular-arm, an

electromagnetic operating mechanism and, a

phonograph -mund box carried on one extremity of said 'arm, and means whereby sound'generated by said electromagnetic operatu ig mechanism may be conveyed either direct to said phonograph sound has or to said tubular arm to the exclusion of said sound box. a

" whereby sound generated ing a pivotaliy mounted tubular arm, an

elect-ro-magnetic operating mechanism and a phonograph sound box having a stylus connected therewith and supported -on one extremity of said tuhuiar arm, means for supporting said tubular arm with relation to a sound record whereby said styius is adapt veyed either directly said phonograph sound box or to said tuhulararm to the en clusion of said sound hos. v

3. A combined phonograph and electroinagnetic sound reproducing unit, compris ing a. pivotally mounted tubular arm, an electro-ina-gnetic operating mechanism and a phonograph sound box carried on one extremity of said arm, and. a valve mechanism positioned intermediate said tubular arm; said electromagnetic operating mechanism and said phonograph sound box, whereby sound generated by said electromagnetic op erating mechanism oi: said phonograph sound box may he independentiy conve'ed to said tubular arm to the exclusion of cit ier said phonograph sound hon or said electromeguetic o crating mechanism.

it. com ined phonograph reproducer or recorder and an eiectro-ma netic sound re producing unit, comprising a pivotaliy mounted sound conveying tubular arm, an eieetro ina netic operating mechanism and a phonograpa sound hos carried on one extremityoii said arm a short tubular connecting member disposed between said elect'ro-magnetic operating mechanism and said 10 3 phonograph sound box, inter-communicating ports in said member, a port in member arranged to convey sound. to said tubular arm, and a valve mechanism. at the unction of said ports whereby sound generated by no said electro-rna netic operating mechanism may he inde enoenily directed to said phonograph. sound has or to said tnhuiar arm.

5. A combined phonograph and aloe-tips magnetic-sound reproducing unit, comprism ing-a pivotaliy mounted tubular arm, a anhstantially if-shaped casting carried on the end thereof, an emetic-magnetic operating mechanismcarried in one and of said i shaped casting and a phonograph sound hos mechanism may he conveyed either directly 1 to said phonograph sound has or to tuhuiar arm to the 'exciusion of said sound hex.

6. A comhined. honograph reproducer or recorder and an eectro-magnctie sound re producing unit, comprising a pivotally mounted sound conveying tubular arm, a phonograph. turn table for carrying a phonograph record adjacent said-arm, an eiectro-magrietic operating mechanism and a PElOBOgZElPil sound box carried on one e.\'- tremity of said arm, a guiding stylus positioned adjacent said electromagnetic open mechanism and adapted to be lowered into or raised from engagement with said record, and whereby souudzgenerated by said electro-1nagnetic operating mechanism may be conveyed either directly to said phonograph sound box forrecording electro-magnetic signals on said record or to sadtubular arm for reproduction to the exclusion of said sound box.

'3'. A combined phonograph and electromagnetic sound reproducing and recording unit, comprising in combination with a phonograph record, a pivotaliy mounted tubular arm, an. electromagnetic operating mechrm'sm, a phonograph sound box having a recording and reproducing stylus adjacent thereto and. carried on one extremity of said arm, a record guiding stylus mounted ad iacent said electromagnetic operating mechanism and adapted to be raised or lowered outot or into engagement with said record,

8. a combined phonograph reproducer or recorder and an electromagnetic sound reproducing unit, comprising in combination with a :arrier for a phonograph record, a pivotally mounted sound conveying tubular a m, an elcctro-magnetic operating mechanism and a phonograph sound box having a stylus carried on one extremity of said arm,

a valve between said arm, said electro-magnetic operating mechanism and said sound box, and an adjustable balancing weight carried by the other end of said arm Wherehy said stylus may be engaged with predetermined pressure against a record on said carrier and sound generated by said electromagnetic opcrating mechanism selectivel directed by said valve to said phonograph sound box for recording or to said tubular arm,

In testimony whereof I hereby aflix my signature.

FRANK D. LEVIS 

